diff --git a/sys/posix/include/sys/bytes.h b/sys/posix/include/sys/bytes.h
index eeae5100710f..fbdef4f495fe 100644
--- a/sys/posix/include/sys/bytes.h
+++ b/sys/posix/include/sys/bytes.h
@@ -28,12 +28,7 @@
 extern "C" {
 #endif
 
-#ifndef __MACH__
 typedef size_t socklen_t;           /**< socket address length */
-#else
-/* Defined for OSX with a different type */
-typedef __darwin_socklen_t socklen_t;   /**< socket address length */
-#endif
 
 #ifdef __cplusplus
 }